There are a total of 29 10-letter words containing 'hex', and the number may vary in different dictionaries. You can specify the dictionary and order.

• cyclohexyl ₃₁
• hexachords ₂₅
• hexacopter ₂₅
• hexahedral ₂₃
• hexahedron ₂₃
• hexamerous ₂₃
• hexameters ₂₂
• hexaploids ₂₄
• hexaploidy ₂₆
• hexapodies ₂₃
• hexarchies ₂₄
• hexastyles ₂₂
• hexavalent ₂₅
• hexokinase ₂₄
• hexastichs ₂₅
• aldohexose ₂₁
• hexactinal ₂₂
• hexadecane ₂₃
• hexaemeric ₂₄
• hexaemeron ₂₂
• hexagynian ₂₄
• hexagynous ₂₄
• hexamerism ₂₄
• hexametral ₂₂
• hexametric ₂₄
• hexandrian ₂₁
• hexandrous ₂₁
• hexangular ₂₁
• hexaplaric ₂₄

There are 29 10-letter words containing hex in the well-known word game dictionary, 9 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 27 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 14 in the Words with Friends (WWF) dictionary.